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-   -   HiWave HiBM65C20F 3-1/2" BMR Wide Range Driver Measurements and Impressions (http://www.diyaudio.com/forums/full-range/225222-hiwave-hibm65c20f-3-1-2-bmr-wide-range-driver-measurements-impressions.html)

Ben_Tech 7th December 2012 10:34 PM

HiWave HiBM65C20F 3-1/2" BMR Wide Range Driver Measurements and Impressions
 
I bought a few of the $7 US HiWave HiBM65C20F-8 BMR wide range drivers. At the price, I could not resist. Initial impression is that they sound good, and it's hard to tell if one is off or on axis as it sounds about the same wherever you stand.

Here is the test cabinet (1.6 liter and well stuffed):

http://i204.photobucket.com/albums/b...5-test-cab.jpg

And, the measurement (close mic about 6", all other speakers, such as the subwoofer, are disabled for the measurement):

http://i204.photobucket.com/albums/b...easurement.jpg

Just using one for a center channel for now. I'll listen for a while (a month or two) and then put a real front baffle on (right now the baffle is 1/4" thick cardboard). I'm currently playing music through it (mono - :D ).

Melo theory 7th December 2012 10:40 PM

Can you say line array?
:D

What do you think of that dip? Must be some phase issue.
There is a big spike in the impedance chart.
Can you post a raw measurement?
Maybe HD as well?
That would be splendid!

Pallas 7th December 2012 10:41 PM

Looks interesting for an up-firing omni-ish surround/ambience speaker.

Melo theory 7th December 2012 10:46 PM

Quote:

Originally Posted by Pallas (Post 3275372)
Looks interesting for an up-firing omni-ish surround/ambience speaker.

Yes! This to!
:)
Try it out Ben!

Ben_Tech 7th December 2012 10:51 PM

Yes, it sounds about the same pointing upward.

Ben_Tech 7th December 2012 10:57 PM

I think there is not as much 'air' as some of the more expensive full range drivers (such as Fountek FR88EX, admittedly six times the price). Although I'm not sure too many people would be missing much above 12K anyway due to hearing issues. We shall see with higher levels and some break in. The HiWave has more bass than expected in a tiny sealed cab and will interface well with a subwoofer at 100 Hz. It's fast at all frequencies and upper bass is very tuneful....

Ben_Tech 7th December 2012 11:03 PM

No smoothing, with phase:

http://i204.photobucket.com/albums/b...with-phase.jpg

This is an in-room measurement and I have a lot of computers with fans running. The room has poor acoustics, but I did close mic it to help with that. Just thought you might want to know.

Melo theory 7th December 2012 11:12 PM

Can u hear that dip? Somebody in another thread said they could but, it looks to be a pretty narrow BW to me.

Ben_Tech 8th December 2012 12:03 AM

No way. :) I'd have to be incredibly familiar with a specific recording and there would have to be some important sonic detail right at that frequency. Then maybe a real human could pick out that that specific detail sounded 'muffled' or some such. I guess I just don't listen to specific tracks over and over like the professional reviewers do. :)

ra7 8th December 2012 12:09 AM

Might be a reflection of the driver surround or the pipe edge.


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